With the application of "24V DC Cooling Fan" new materials and technologies, three blade fan design initial potential energy-saving advantages of being ignored. It was found with the new materials and new technology to produce four blades, wind power and energy consumption of 6 or 9 blade fan blades produce more than three blades of the wind generated by large fans, and now the power is relatively well developed, the energy consumption is negligible. Second and technological development of a relationship, it is now seen three "24V DC Cooling Fan" The fans are early modern design, design concept was limited to the level of understanding and mechanics. Part 3 fans still in use today, but now has basically been rare. Now the production of "24V DC Cooling Fan" With the development of science and technology with the leaves of a variety of changes, such as increasing the number of blades, blade angle increased resulting in a greater wind. This is related to the development of modern technology such as design concepts, materials, updates, improved motor technology and so have a great relationship.